Negative Thermal Expansion in (Hf,Ti)Fe2 Induced by the Ferromagnetic and Antiferromagnetic Phase Coexistence
Negative Thermal Expansion in (Hf,Ti)Fe2 Induced by the Ferromagnetic and Antiferromagnetic Phase Coexistence
复制标题
铁磁相和反铁磁相共存引起的 (Hf,Ti)Fe2 负热膨胀
DOI：
10.1021/acs.inorgchem.8b03600
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发表时间：
2019
影响因子：
4.6
通讯作者：
Xing Xianran
中科院分区：
文献类型：
--
作者：
Qiao Yongqiang;Song Yuzhu;Lin Kun;Liu Xinzhi;Franz Alex;ra;Ren Yang;Deng Jinxia;Huang Rongjin;Li Laifeng;Chen Jun;Xing Xianran
负热膨胀(NTE)是一种有趣的物理现象，可用于材料的热膨胀调节。在本研究中，我们报道了一种(Hf，Ti)Fe2的NTE化合物，而HfFe2和TiFe2的两端成员都表现出正的热膨胀。结果表明，在整个NTE区存在相共存现象，其中一个相为铁磁相(FM)，另一个相为反铁磁相(AFM)。随着温度的升高，FM相逐渐向AFM相转变。由于AFM相的晶胞体积小于FM相的晶胞体积，且AFM相的质量分数随温度的升高而增大，因此在目前的(Hf，Ti)Fe2中出现了NTE现象。在未来的研究中，相共存的构建可以成为实现纳米材料的一种方法。
Negative thermal expansion (NTE) is an intriguing physical phenomenon that can be used in the applications of thermal expansion adjustment of materials. In this study, we report a NTE compound of (Hf,Ti)Fe2, while both end members of HfFe2and TiFe2show positive thermal expansion. The results reveal that phase coexistence is detected in the whole NTE zone, in which one phase is ferromagnetic (FM), while the other is antiferromagnetic (AFM). With increasing temperature, the FM phase is gradually transformed to the AFM one. The NTE phenomenon occurs in the present (Hf,Ti)Fe2because of the fact that the unit cell volume of the AFM phase is smaller than that of the FM phase, and the mass fraction of the AFM phase increases with increasing temperature. The construction of phase coexistence can be a method to achieve NTE materials in future studies.